Subversion Repositories openrisc

//==========================================================================
//
//      plf_misc.c
//
//      HAL platform miscellaneous functions
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####                                            
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under    
// the terms of the GNU General Public License as published by the Free     
// Software Foundation; either version 2 or (at your option) any later      
// version.                                                                 
//
// eCos is distributed in the hope that it will be useful, but WITHOUT      
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or    
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    
// for more details.                                                        
//
// You should have received a copy of the GNU General Public License        
// along with eCos; if not, write to the Free Software Foundation, Inc.,    
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            
//
// As a special exception, if other files instantiate templates or use      
// macros or inline functions from this file, or you compile this file      
// and link it with other works to produce a work based on this file,       
// this file does not by itself cause the resulting work to be covered by   
// the GNU General Public License. However the source code for this file    
// must still be made available in accordance with section (3) of the GNU   
// General Public License v2.                                               
//
// This exception does not invalidate any other reasons why a work based    
// on this file might be covered by the GNU General Public License.         
// -------------------------------------------                              
// ####ECOSGPLCOPYRIGHTEND####                                              
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    ysayo
// Contributors: ysato
// Date:         2002-08-10
// Purpose:      HAL miscellaneous functions
// Description:  This file contains miscellaneous functions provided by the
//               HAL.
//
//####DESCRIPTIONEND####
//
//========================================================================*/
 
#include <pkgconf/hal.h>
 
#include <cyg/infra/cyg_type.h>         // Base types
 
#include <cyg/hal/hal_arch.h>           // architectural definitions
#include <cyg/hal/hal_io.h>
#include <cyg/hal/hal_if.h>
#include <cyg/hal/plf_intr.h>
#include <cyg/hal/var_arch.h>
 
/*------------------------------------------------------------------------*/
 
void hal_platform_init(void)
{
    hal_if_init();
}
 
void h8300h_reset(void)
{
    __asm__ ("ldc #0x80,ccr\n"
             "jmp @@0\n\t");
}
 
/*------------------------------------------------------------------------*/
/* Control C ISR support                                                  */
 
#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)
 
struct Hal_SavedRegisters *hal_saved_interrupt_state;
 
#endif
 
/*------------------------------------------------------------------------*/
/* clock support                                                            */
 
void hal_clock_initialize(cyg_uint32 period)
{
    CYG_BYTE prescale;
#if CYGNUM_HAL_H8300_RTC_PRESCALE == 8
    prescale = 0x01;
#else
#if CYGNUM_HAL_H8300_RTC_PRESCALE == 64
    prescale = 0x02;
#else
#if CYGNUM_HAL_H8300_RTC_PRESCALE == 8192
    prescale = 0x03;
#else
#error illigal RTC prescale setting
#endif
#endif
#endif
    HAL_WRITE_UINT8(CYGARC_TCORA3,period);
    HAL_WRITE_UINT8(CYGARC_8TCNT3,0x00);
    HAL_WRITE_UINT8(CYGARC_8TCR3,0x48 | prescale);
    HAL_WRITE_UINT8(CYGARC_8TCSR3,0x00);
}
 
void hal_clock_reset(cyg_uint32 vector, cyg_uint32 period)
{
    HAL_WRITE_UINT8(CYGARC_8TCR3,0x00);
    HAL_WRITE_UINT8(CYGARC_8TCSR3,0x00);
    hal_clock_initialize(period);
}
 
void hal_clock_read(cyg_uint32 *pvalue)
{
    CYG_BYTE val;
    HAL_READ_UINT8(CYGARC_8TCNT3,val);
    *pvalue = val;
}
 
//---------------------------------------------------------------------------
// Low-level delay (in microseconds)
 
#if 0
void hal_delay_us(int usecs)
{
    volatile CYG_BYTE *tcr  = (CYG_BYTE *)CYGARC_8TCR2;
    volatile CYG_BYTE *tcnt = (CYG_BYTE *)CYGARC_8TCNT2;
    short clocks_per_us = (CYGHWR_HAL_H8300_PROCESSOR_SPEED/1000000)/8*25;
    //short clocks_per_us = (CYGHWR_HAL_H8300_PROCESSOR_SPEED/1000000)/20;
    unsigned char val1,val2;
    short diff;
 
    usecs /= 25;
 
    *tcnt = 0x00;
    *tcr  = 0x01;
 
    diff = 0;
    while (usecs > 0) {
	while (diff < clocks_per_us) {
            val1 = *tcnt;
	    while ((val2 = *tcnt) == val1);
	    if (val2 < val1)
	        diff += val2 + 0x100 - val1;
	    else
		diff += val2 - val1;
	}
	usecs -= diff / clocks_per_us;
	diff -= clocks_per_us;
    }
    *tcr  = 0x00;
}
#endif
 
/*------------------------------------------------------------------------*/
/* End of plf_misc.c                                                      */